30 THE ADVANCE OF SCIENCE 



thing about the doers of it. Meddling 

 with questions of merit and priority is a 

 thorny business at the best of times, and 

 unless in case of necessity, altogether un- 

 desirable when one is dealing with con- 

 temporaries. No such necessity lies upon 

 me ; and I shall, therefore, mention no 

 names of living men, lest, perchance, I 

 should incur the reproof which the Is- 

 raelites, who struggled with one an- 

 other in the field, addressed to Moses — 

 'Who made thee a prince and a judge 

 over us \ ' 



The aim Physical science is one and indivisible. 



icaisci- Although, for practical purposes, it is 

 convenient to mark it out into the pri- 

 mary regions of Physics, Chemistry, and 

 Biology, and to subdivide these into sub- 

 ordinate provinces, yet the method of 

 investigation and the ultimate object of 

 the physical inquirer are everywhere the 

 same. 



ence, 



